The Starrett A19 Oops Hole Saw Arbor is a specialist accessory designed to enlarge existing holes without the need for a conventional pilot drill. This innovative arbor allows tradespeople to increase hole diameters by using a hole saw matching the existing hole size as a guide for the larger cutting saw. The A19 arbor replaces the standard pilot drill on your existing arbor system, enabling precise enlargement of holes with a minimum expansion of 3/16" (4.7mm). This makes it particularly useful
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